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Reactive extrusion process for producing barium hydrogen phosphate

A reactive extrusion, barium hydrogen phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of large particle size of barium hydrogen phosphate, affecting product performance, mixing by-product impurities, etc., to achieve production. The effect of low cost, lower energy consumption and shorter reaction time

Inactive Publication Date: 2014-08-20
广东宇星阻燃新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the large particle size of the barium hydrogen phosphate particles obtained by the above method, it is easy to mix by-product impurities in the process of barium hydrogen phosphate crystallization, which affects product performance.

Method used

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  • Reactive extrusion process for producing barium hydrogen phosphate
  • Reactive extrusion process for producing barium hydrogen phosphate
  • Reactive extrusion process for producing barium hydrogen phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for producing barium phosphate with reactive extrusion process, comprising the following steps:

[0030] (1) After mixing 1970g of barium carbonate and 2400g of sodium dihydrogen phosphate, the mixture is reacted and extruded on a twin-screw extruder, and a white muddy product is obtained through reaction and extrusion; the reaction extrusion temperature is 50°C;

[0031] (2) Store the product of step (1) in a sealed environment at 50°C, and ripen for 24 hours;

[0032] (3) Washing, filtering and drying the product of step (2) to obtain white barium hydrogen phosphate powder. After testing, the yield of the product obtained in this embodiment is 98%. The particle size analysis of the barium hydrogen phosphate of gained is shown in Table 1, and the infrared detection spectrum is shown in figure 1 .

Embodiment 2

[0041] A method for producing barium phosphate with reactive extrusion process, comprising the following steps:

[0042] (1) After mixing 2590g of barium bicarbonate and 2720g of potassium dihydrogen phosphate, the mixture is reacted and extruded on a twin-screw extruder, and a white muddy product is obtained through reaction extrusion; the reaction extrusion temperature is 40°C;

[0043] (2) Store the product of step (1) in a sealed environment at 20°C, and ripen for 48 hours;

[0044] (3) Washing, filtering and drying the product of step (2) to obtain white barium hydrogen phosphate powder. After testing, the yield of the product obtained in this embodiment is 97%. The particle size analysis of the barium hydrogen phosphate obtained is shown in Table 2, and the infrared detection spectrum is shown in figure 2 .

[0045] The particle size analysis of the barium hydrogen phosphate that table 2 embodiment 2 and comparative example 1 make

[0046]

[0047] fig...

Embodiment 3

[0049] A method for producing barium phosphate with reactive extrusion process, comprising the following steps:

[0050] (1) After mixing 1710g barium hydroxide and 2300g ammonium dihydrogen phosphate, the mixture is reacted and extruded on a twin-screw extruder, and a white muddy product is obtained through reaction extrusion; the reaction extrusion temperature is 60°C;

[0051] (2) Store the product of step (1) in a sealed environment at 60°C, and ripen for 12 hours;

[0052] (3) Washing, filtering and drying the product of step (2) to obtain white barium hydrogen phosphate powder. After testing, the yield of the product obtained in this embodiment is 96%. The particle size analysis of the barium hydrogen phosphate obtained is shown in Table 3, and the infrared detection spectrum is shown in image 3 .

[0053] The particle size analysis of the barium hydrogen phosphate that table 3 embodiment 3 and comparative example 1 make

[0054]

[0055] image 3 It is...

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Abstract

The invention discloses a method for reactive extrusion process for producing barium hydrogen phosphate. The method comprises the following steps: (1) mixing a barium-containing compound with dihydric phosphate, and conducting reactive extrusion on the mixture in a double screw extruder; (2) slaking he products from the step (1) at 20-80 DEG C for 4-48 h; and (3) washing, filtering and drying the products obtained from the step (2), so as to obtain barium hydrogen phosphate. High torque and high speed of the double screw extruder make the reactants react fast, so as to shorten reaction time and reduce energy consumption. And the method provided by the invention can prepare barium hydrogen phosphate particles with particle size smaller than 10 microns.

Description

technical field [0001] The invention belongs to the technical field of barium hydrogen phosphate preparation, and in particular relates to a method for producing barium hydrogen phosphate by a reactive extrusion process. Background technique [0002] Barium hydrogen phosphate is an inorganic phosphorus flame retardant, its chemical name is BaHPO4, it has the characteristics of slightly soluble in water, not easy to volatilize, and good thermal stability. At present, the production method of barium hydrogen phosphate is mainly to use phosphoric acid and barium hydroxide as raw materials, react with heating and stirring in an aqueous solution, and then obtain barium hydrogen phosphate dry powder after filtering, washing, centrifugal dehydration, drying and crushing. [0003] Because the particle size of the barium hydrogen phosphate particles obtained by the above method is relatively large, by-product impurities are easily mixed in the process of barium hydrogen phosphate cry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 罗宏波马访中甄利军罗章志刘敏顾湘
Owner 广东宇星阻燃新材股份有限公司
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